<template>
  <div class="login_container">
    <!-- 登录面板 -->
    <div class="login_box">
      <!-- 默认头像 -->
      <div class="avatar_box">
        <img src="@/assets/logo.png" alt="">
      </div>
      <!-- 登录表单区 -->
      <el-form class="login_form" label-width="0px" :model="form" :rules="form.rules" ref="loginFormRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="form.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input type="password" prefix-icon="iconfont icon-3702mima" v-model="form.password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLogin">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data(){
    return{
      // 登录表单的数据对象
      form:{
        username:'',
        password:'',
        // 表单验证
        rules: {
          username: [
            { required: true, message: '请输入用户名', trigger: 'blur' },
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
          ],
          password:[
            {required:true,message:'请输入密码',trigger: 'blur'},
            { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
          ]
        }
      }
    }
  },
  methods:{
    // 点击重置按钮，重置登录表单
    resetLogin(){
      this.$refs.loginFormRef.resetFields()
    },
    // 点击进行表单验证
    login(){
      this.$refs.loginFormRef.validate(async (valid)=>{
        if(!valid) return;
        let {username,password} = this.form
        const {data:res} = await this.$http.post('login',{username,password})
        // 根据请求返回的meta状态码，若状态码不为200，则请求失败
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
        this.$message.success(res.meta.msg)
        //1. 将登录成功之后的 token ，保存到 sessionStorage 中
        // 1.1 项目中出现登录之外的其他 API 接口，必须在登录之后才能访问
        // 1.2 token 只应在当前网站打开期间生效，所以将token 保存在sessionStorage 中
        window.sessionStorage.setItem('token',res.data.token)
        //2. 通过编程式导航跳转到后台主页，路由的地址是 /home
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;

    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
    .btns{
    display: flex;
    justify-content: flex-end;
    }
  }
  
}
</style>